// Copyright 2004-2010 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Fas.Tem.Runtime.Parser.Node
{
    using Context;
    using System.IO;

    public class ASTIfStatement : SimpleNode
    {
        public ASTIfStatement(int id) : base(id)
        {
        }

        public ASTIfStatement(Parser p, int id) : base(p, id)
        {
        }

        /// <summary>
        /// Accept the visitor.
        /// </summary>
        public override object Accept(IParserVisitor visitor, object data)
        {
            return visitor.Visit(this, data);
        }

        public override bool Render(IInternalContextAdapter context, TextWriter writer)
        {
            // Check if the #if(expression) construct evaluates to true:
            // if so render and leave immediately because there
            // is nothing left to do!
            if (GetChild(0).Evaluate(context))
            {
                GetChild(1).Render(context, writer);
                return true;
            }

            int totalNodes = ChildrenCount;

            // Now check the remaining nodes left in the
            // if construct. The nodes are either elseif
            // nodes or else nodes. Each of these node
            // types knows how to evaluate themselves. If
            // a node evaluates to true then the node will
            // render itself and this method will return
            // as there is nothing left to do.
            for (int i = 2; i < totalNodes; i++)
            {
                if (GetChild(i).Evaluate(context))
                {
                    GetChild(i).Render(context, writer);
                    return true;
                }
            }

            // This is reached when an ASTIfStatement
            // consists of an if/elseif sequence where
            // none of the nodes evaluate to true.
            return true;
        }

        public void Process(IInternalContextAdapter context, IParserVisitor visitor)
        {
        }
    }
}